Analysis of Rankine Cycle: Techno-economically Feasible Thermodynamic Model

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Analysis of Rankine Cycle Techno-economically
Feasible Thermodynamic Model
P M V Subbarao Professor Mechanical Engineering
Department
An appropriate selection of operational
parameters Processes
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Optimal Design of Vapour Power Plant
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pmax10MPa
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pmax10MPa
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hturb,in
hturb,out
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If Carnot Studies The Rankine Cycle !
smin
smax
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Carnotization of Rankine Cycle

• Equivalent Carnot cycle of Rankine Cycle

• Heat Addition in Steam Generator, qin

• Mean Effective Temperature of heat addition for
  equivalent isothermal process or entropy averaged
  temperature

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Equivalent Carnot Model of Rankine Model

• Heat rejection in Steam Condenser, qin

• Mean Effective Temperature of heat rejection for
  equivalent isothermal process.

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Equivalent Carnot Model of Rankine Model
Tm,in
Tm,out
smin
smax
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Analysis of Equivalent Carnot Model

• Net work out put
• Heat Input

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Parametric Study of Rankine Cycle
h
Tmax
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Ideal Rankine Cycle P-h Diagram
pmax17Mpa h42.05 Tequi284.40C
pmax5Mpa h37.8 Tequi246.30C
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Selection of Optimum Boiler Pressure
Tmax 450 oC
h
Pressure, MPa
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Selection of Optimum Boiler Pressure
Tmax 450 oC
x
Pressure, MPa
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Selection of Optimum Boiler Pressure
Tmax 450 oC
xh
Pressure, MPa
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Progress in Rankine Cycle
Year 1907 1919 1938 1950 1958 1959 1966 1973 1975
MW 5 20 30 60 120 200 500 660 1300
p,MPa 1.3 1.4 4.1 6.2 10.3 16.2 15.9 15.9 24.1
Th oC 260 316 454 482 538 566 566 565 538
Tr oC -- -- -- -- 538 538 566 565 538
FHW -- 2 3 4 6 6 7 8 8
Pc,kPa 13.5 5.1 4.5 3.4 3.7 3.7 4.4 5.4 5.1
h, -- 17 27.6 30.5 35.6 37.5 39.8 39.5 40
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qin
wnet
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qin
wnet
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htur.,in
htur.,out
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htur.,in
htur.,out
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Selection of Optimum Boiler Pressure
Tmax 450 oC
xh
Pressure, MPa
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Parametric Study of Rankine Cycle
w, kJ/kg
Tmax, 0C
650
450
550
250
150
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